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Add textfield for PINs with unknown length to ParentAccessView as
alternative to current field that needs to know pin length in advance.

Add option to hide entered pin.

Add binding of Escape key to closing the view.


These (independent) changes are part of a larger refactoring with the
aim to make the UI in this class reuseable, in particular for
smartcard login.

Bug: 1001288
Change-Id: Ib0d3879780affe5a09c5ea4f1b8864120ca210c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2007717Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Fabian Sommer <fabiansommer@google.com>
Cr-Commit-Position: refs/heads/master@{#734873}